So I have a random assortment of backyard chickens. My roo is a buff Cochin bantam. There are four standard hens. An EE, a cuckoo marans, and two white Sussex. I've noticed the roo doing his business with all the hens, but figured with the size difference, the eggs would be infertile. About a month ago, one of the Sussex went broody on a handful of eggs. I decided to let her run the course and in a month just throw the eggs out. A week or two into it I candled the 5 eggs she was on. Two EE, two Sussex and a marans. Much to my surprise the EEs and the marans had chicks inside. Today they hatched. The marans chick pecked a hole and died without ever emerging. Both EEs came out and are doing fine. I'm wondering, if my Cochin bantam roo has bred with my EE standard hen, what sort of chicks do I have. They are both buff colored, the size of standard chicks, feathered legs. One has a small dark brown spot on the back of its head. Will they carry a blue eggs gene?